Blower

Abstract

A blower may include a motor; a centrifugal fan configured to rotate with rotation of the motor; a casing configured to guide air from a suction port to a discharge port; a trigger configured to be pressed; and a control board configured to control rotation of the motor. The control board may include a normal mode and a low speed mode. In the normal mode, the control board may be configured to adjust a rotation speed of the motor in accordance with a degree by which the trigger is pressed. In the low speed mode, the control board may be configured to adjust the rotation speed of the motor to a target rotation speed, wherein the target rotation speed is lower than a maximum rotation speed of the motor that is achieved when the degree by which the trigger is pressed is a maximum degree in the normal mode.

What is claimed is: 
     
       1. A blower, comprising:
 a motor; 
 a centrifugal fan configured to rotate about a rotation shaft with rotation of the motor; 
 a casing which houses the motor and the centrifugal fan and is configured to guide air from a suction port to a discharge port as the centrifugal fan rotates: 
 a trigger configured to be pressed by an operator; and 
 a control board configured to control rotation of the motor, 
 wherein 
 the control board includes a normal mode and a low speed mode, 
 in the normal mode, the control board is configured to adjust a rotation speed of the motor in accordance with a degree by which the trigger is pressed, and 
 in the low speed mode, the control board is configured to adjust the rotation speed of the motor to a target rotation speed, wherein the target rotation speed is lower than a maximum rotation speed of the motor that is achieved when the degree by which the trigger is pressed is a maximum degree in the normal mode. 
 
     
     
       2. The blower according to  claim 1 , wherein when the control board is in the low speed mode, the rotation speed of the motor gradually increases to the target rotation speed as the degree by which the trigger is pressed increases to the maximum degree. 
     
     
       3. The blower according to  claim 1 , wherein when the control board is in the low speed mode, the rotation speed of the motor is constant at the target rotation speed regardless of the degree by which the trigger is pressed. 
     
     
       4. The blower according to  claim 1 , further comprising a switch configured to switch the normal mode and the low speed mode of the control board. 
     
     
       5. The blower according to  claim 4 , wherein
 the switch functions as a main power switch configured to switch an on-state in which the rotation of the motor is allowed and an off-state in which the rotation of the motor is prohibited, and 
 when the switch is long-pressed, the normal mode and the low speed mode of the control board are switched. 
 
     
     
       6. The blower according to  claim 1 , further comprising a display configured to display that the control board is in the low speed mode.